Losing validation error messages

Hello all,
I am pretty new to Rails and have recently started on a simple
project with it…
I have a simple home_controller and home/index.rhtml page that
displays a login/registration form.
The login/registration actions are handled by users_controller.rb.

register action in users_controller always redirects back
to :controller => “home”, :action => “index”…

The whole site uses one layout: application.rhtml.

The problem is if there is an error in registration process, for
example a validation error, the errors are not displayed in the home/
index.rhtml. My guess is during the redirect, the error messages get
lost as they are not flashed…

Two questions: am I doing this correctly (meaning having
user_controller redirect to home controller) and second how can I get
the error messages to display properly?

Thanks,
Cagan